I have a set of RE 4" lift (standard), and I am very happy with it. It is stiffer than the stock ride, but not unlike a pickup truck, so I am OK with it.
Regarding roll issues on curves, I have not problems even though the rear track bar is removed, and I currently have the sway bar disconnected. I even installed the lift kit myself (I had no additional help) during a weekend (the SYE took me more time because I did not have the correct snap ring pliers, but that's a whole different story!).
I would strongly recommend the RE lift kit, especially if you plan to run a SYE kit!
Felipe